I have a client that asked me to analyze if we can turn off TFTP service if it is not being used. I honestly didn't know what TFTP (Trivial FTP) was until I started researching, and I have no clue how to determine if it is being used.
Doe anyone have information on determining usage?
Thanks! A double Caramel Macchiato for anyone with an answer!

Answer Wiki

You can make router as tftp server but for this u should check the running config on router to check if you are using or not.

Do a netstat then a 3 for connections, F14 to sort by local port and find your TFTP port. The listener will have an *. If there are incoming TFTP sessions you might seem there if you are reviewing it often.

That said, we turned this off for PCI(it’s a vulnerability) with no adverse effects to any system or incoming processes. We are a large shop with communications to many different types of systems and platforms. If this is for PCI, FYI we also turned off Network Station Manager and the Logon Daemon, NFS, LDAP and REXex. No one ever figured out why they were autostarted in the first place.

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TFTP is commonly used to serve firmware or configuration files to some devices. I would expect that the TFTP service would keep a log of the files it has served, and maybe you could use it to see if it is being used.

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